Sorry about quality of photos. The bird is in center. Photos taken 22nd February 2015.
Presumed first winter Caspian Gull. Bird showed pale edges to medium coverts and greater coverts forming 'wing bars along these tracts. Secondaries blackish with broad whitish tips forming pale trailing edge. This carried on to tertials. Nape greyish continuing to sides of neck. The bird is untypically hunched up in these photos.